Apply to all fields is used during setting up the link between title and datasource ONLY! This is usefull ONLY when te datasource collumns match in name those of the title fields (see helpfiles) .
Once the links are setup between datasource and title any selection of a different row in the datasource will be reflected to the title for ALL the textfields connected to that datasources row content.
Used properly it doesnt matter if there are 40 or 4000 contestants in the datasource, you only have to select the correct row in the datasource, nothing more

One can not force selecting different rows content for the same title unless you convert rows to columns but above mentioned setup ( naming) will still apply

Nothing stops yu from haveing multiple copies of the same datasource in the datasource manager say one for contestant A title and one for contestant B title ;-)

dont need to duplicate the source itself, just load it twice in manager!